Yes, you can visit both Disneyland Park and Walt Disney Studios Park in a single day, as the two parks are located just a 5-minute walk apart across a central esplanade. However, doing so requires a "2-Parks" dated ticket and a rigorous strategy. To succeed, guests should "rope drop" (arrive before opening) at Walt Disney Studios Park to hit high-demand rides like Crush’s Coaster or Spider-Man W.E.B. Adventure, then hop to the main Disneyland Park by late morning. Utilizing "Disney Premier Access" to skip lines for headliners can save hours of waiting. Focus on the "Must-Dos"—such as Pirates of the Caribbean, Big Thunder Mountain, and the Ratatouille attraction—rather than trying to see every show. While you won't experience every single attraction, a well-planned itinerary allows you to catch the parade and the nightly "Disney Illuminations" fireworks show at the castle, making for a very full but highly rewarding day of Disney magic in Paris.